/*      $OpenBSD: swaplist.c,v 1.14 2019/12/05 12:46:54 mpi Exp $       */
/*      $NetBSD: swaplist.c,v 1.8 1998/10/08 10:00:31 mrg Exp $ */

/*
 * Copyright (c) 1997 Matthew R. Green
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>  /* dbtob */
#include <sys/types.h>
#include <sys/swap.h>

#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "swapctl.h"

#define dbtoqb(b) dbtob((int64_t)(b))

void
list_swap(int pri, int kflag, int pflag, int dolong)
{
        struct  swapent *sep, *fsep;
        long    blocksize;
        char    *header;
        size_t  l;
        int     hlen, totalsize, size, totalinuse, inuse, ncounted, pathmax;
        int     rnswap, nswap, i;

        nswap = swapctl(SWAP_NSWAP, 0, 0);
        if (nswap < 1)
                errx(1, "no swap devices configured");

        fsep = sep = calloc(nswap, sizeof(*sep));
        if (sep == NULL)
                err(1, "calloc");
        rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
        if (rnswap == -1)
                err(1, "SWAP_STATS");
        if (nswap != rnswap)
                warnx("SWAP_STATS different to SWAP_NSWAP (%d != %d)",
                    rnswap, nswap);

        pathmax = 11;
        if (kflag) {
                header = "1K-blocks";
                blocksize = 1024;
                hlen = strlen(header);
        } else
                header = getbsize(&hlen, &blocksize);

        if (dolong) {
                for (i = rnswap; i-- > 0; sep++)
                        if (pathmax < (l = strlen(sep->se_path)))
                                pathmax = l;
                sep = fsep;
                (void)printf("%-*s %*s %8s %8s %8s  %s\n",
                    pathmax, "Device", hlen, header,
                    "Used", "Avail", "Capacity", "Priority");
        }
        totalsize = totalinuse = ncounted = 0;
        for (; rnswap-- > 0; sep++) {
                if (pflag && sep->se_priority != pri)
                        continue;
                ncounted++;
                size = sep->se_nblks;
                inuse = sep->se_inuse;
                totalsize += size;
                totalinuse += inuse;

                if (dolong) {
                        (void)printf("%-*s %*ld ", pathmax, sep->se_path, hlen,
                            (long)(dbtoqb(size) / blocksize));

                        (void)printf("%8ld %8ld %5.0f%%    %d\n",
                            (long)(dbtoqb(inuse) / blocksize),
                            (long)(dbtoqb(size - inuse) / blocksize),
                            (double)inuse / (double)size * 100.0,
                            sep->se_priority);
                }
        }
        if (dolong == 0)
                printf("total: %ld %*s allocated, %ld used, "
                    "%ld available\n",
                    (long)(dbtoqb(totalsize) / blocksize),
                    hlen, header,
                    (long)(dbtoqb(totalinuse) / blocksize),
                    (long)(dbtoqb(totalsize - totalinuse) / blocksize));
        else if (ncounted > 1)
                (void)printf("%-*s %*ld %8ld %8ld %5.0f%%\n", pathmax, "Total",
                    hlen,
                    (long)(dbtoqb(totalsize) / blocksize),
                    (long)(dbtoqb(totalinuse) / blocksize),
                    (long)(dbtoqb(totalsize - totalinuse) / blocksize),
                    (double)(totalinuse) / (double)totalsize * 100.0);
        free(fsep);
}